Boards
I've had messages waiting to be listened to on my work phone for 3 years.
No idea how many, but the little message icon has been on since September/October 2009.
I was supposed ask IT to set up a PIN to access them shortly after starting this job, but I didn't and now it's far too late to ask them. Quite frankly, I'd look daft.
What things have you left too long to do anything about?